Spatially Resolved Kinematics of Binary Quasar Candidates

Transcription

1 Spatially Resolved Kinematics of Binary Quasar Candidates IFU Spectroscopy with VIMOS/VLT Ivana Stoklasová Orlitová Astronomical Institute, Academy of Sciences, Prague, Czech Republic In collaboration with: B. Jungwiert, T. Skalická, M. Křížek, L. Jílková, I. Ebrová, K. Bartošková

2 Introduction: Binary Quasar Candidates in SDSS Double-peaked [O III] lines in SDSS e. g. Liu et al. (2a), Smith et al. (2) Follow-up observations: NIR and optical imaging, slit spectroscopy, IFU spectroscopy (Rosario et al. 2; Liu et al. 2b; Shen et al. 2; Fu et al. 22) Liu et al. (2) Liu et al. (2)

3 Our VIMOS/VLT observations (2) Stoklasová (PI), Jungwiert, Bartáková, Bartošková, Ebrová, Jílková, Křížek Targets: Selected low-z targets (pilot study) from Liu et al. (2a) Selection by redshift (3 < z < 7), luminosity and RA Goals: Observe selected candidates with VIMOS Derive spatial kinematics and [O III]/Hβ ratio Interpretation detailed exploration of 3D data cubes binary AGN rotation, outflow (double-peaked lines frequent in Seyferts) projection of two galaxies along LOS

4 VIMOS/VLT observations ESO program number 8.B-669 Targets: SDSS J Q48 SDSS J Q SDSS J Q9 SDSS J Q66 SDSS J Q23 9 Observations in spring/summer 2 High-resolution spatial sampling.33"/pixel Seeing.6".8" (i. e. resolution. kpc) FOV: 3" 3" High spectral resolution (R =, dispersion. Å/pixel) resolution2km/s Spectral range Å (HR blue grism) [O III], Hβ Integration 8 s for each target We have approx. 3 resultant emission spectra per target

5 VIMOS Stellar continuum Central 2 3 kpc Q48 Continuum 4-6 A Q Continuum 4-6 A Q48 z = 378 " =.7 kpc Q z = 2 " = kpc Q9 Continuum 4-6 A Q66 Continuum 4-6 A 2 2 Q9 z = 678 " =.3 kpc -. - Q66 z = 34 " =.67 kpc

6 VIMOS [O III] Emission maps Aligned with continuum, extent:. 3 kpc Intensity in [OIII] 7, both comp s Intensity in [OIII] 7 9. Q48 z = 378 " =.7 kpc Q z = 2 " = kpc Intensity in [OIII] 7, both comp s Intensity in [OIII] 7, both comp s Q9 z = 678 " =.3 kpc Q66 z = 34 " =.67 kpc

7 VIMOS [O III] spectra integrated over FOV Diagnostics following Blecha et al. (22) and Smith et al. (2) Peak separation [km/s]: 27, 4, 4, 3 Centroid offset from v sys [km/s]: 8,, 8, 46 ( no BH influence?) Ratios of peak fluxes:.7,.7,.7,.9 ( no BH influence?) flux flux q48, FOV-integ. spectrum -- [OIII] wavelength [A] q9, FOV-integ. spectrum -- [OIII] wavelength [A] flux flux q, FOV-integ. spectrum -- [OIII] wavelength [A] q66, FOV-integ. spectrum -- [OIII] wavelength [A]

8 VIMOS - [O III] spectra spatially resolved Spectral line profiles: from simple narrow to complex Q Q9 3 Spec No Spec No Spec No Spec No Spec No Spec No Spec No.82 Spec No

9 VIMOS Q J69+72, z = 2, " = 3 pixels = kpc Q Continuum 4-6 A Intensity in [OIII] Mean LOS velocity in [OIII] 7 FWHM of [OIII]

10 Theoretical I, v, σ maps Code by Jugwiert et al. (27) Velocity maxima off-axis: in elliptical rotation, or circular rotation + outflow Rotating disk flat v r Elliptical rotation Expanding disk Outflow in a cone

11 VIMOS Q D velocity profiles along slits Radial profiles indicate rotation Velocity [OIII] PA=-4. Velocity [OIII] PA=. 2 2 Velocity [km/s] - Velocity [km/s] R [] R []

12 VIMOS Q Velocity channel maps for [O III] 7 Range: ( 44,42) km/s channel:6km/s

13 Outflow in Disk (-,-8) km/s Outflow in Disk (,) km/s Outflow in Disk (6,8) km/s Outflow in Disk (4,6) km/s Outflow in Disk (-8,-6) km/s Outflow in Disk (,2) km/s Outflow in Disk (8,) km/s Outflow in Disk (6,8) km/s Outflow in Disk (-6,-4) km/s Outflow in Disk (2,4) km/s Outflow in Disk (,2) km/s Outflow in Disk (8,2) km/s Outflow in Disk (-4,) km/s Outflow in Disk (4,6) km/s Outflow in Disk (2,4) km/s Theoretical velocity channel maps Rotating disk flat v r Outflow in a hollow cone

14 Theoretical velocity channel maps Elliptical rotating disk

15 VIMOS Q Position-velocity diagrams P-V diagram for [OIII] 7, PA = -4 deg P-V diagram for [OIII] 7, PA = deg velocity [km/s] velocity [km/s] P-V diagram for [OIII] 7, PA = 4 deg P-V diagram for [OIII] 7, PA = 9 deg velocity [km/s] velocity [km/s]

16 Theoretical position-velocity diagrams Rotating disk (flat v r ) PA =, 3, 6, 9 Expanding disk PA =, 3, 6, 9

17 V V V V V V Theoretical position-velocity diagrams Elliptical disk Outflow in a hollow cone PA = PA = R PA = 2 PA = 3 R R PA = 4 PA = R R R

18 VIMOS Q [O III]/Hβ [O III]/Hβ >3, i. e. high excitation (AGN) [O III]7 /Hβ map [O III]7 /Hβ radial graph [OIII] 7 / H_beta, q - Ratio [OIII] 7 / Hb 2.. [OIII] 7 / H_beta indiv. spaxels - receding indiv. spaxels - approaching FOV-integ. spectrum - system FOV-integ. spectrum - system 2 Ho et al. (997) R []

19 Q Interpretation Elliptical ring (r = 2.kpc)? 2emission-lineregions(kpcsepation), off-centered,butalignedwithcontinuum High excitation ([O III]/Hβ) Simple narrow lines (2 km/s) FOV spectrum double-peaked Velocity map: rotation (?), maxima off-axis D rotation curve at PA = 4 deg Velocity channel maps: do not have the V-shapes typical of rotation. Effect of resolution? P-V diagrams: rotation (?) FWHM different in the two parts of the ring

20 VIMOS Other targets Q9 I[OIII]compcomp2 v[oiii]compcomp2 FWHM[OIII]compcomp2 Intensity in [OIII] 7, blue comp Mean LOS vel. in [OIII] 7, blue comp FWHM of [OIII] 7, blue comp Intensity in [OIII] 7, red comp Mean LOS vel. in [OIII] 7, red comp FWHM of [OIII] 7, red comp

21 VIMOS Other targets Q48 I[OIII]compcomp2 v[oiii]compcomp2 FWHM[OIII]compcomp Intensity in [OIII] 7, blue comp Mean LOS vel. in [OIII] 7, blue comp FWHM of [OIII] 7, blue comp Intensity in [OIII] 7, red comp 6. Mean LOS vel. in [OIII] 7, red comp FWHM of [OIII] 7, red comp

22 VIMOS Other targets Q66 I[OIII]compcomp2 v[oiii]compcomp2 FWHM[OIII]compcomp2 Intensity in [OIII] 7, blue comp Mean LOS vel. in [OIII] 7, blue comp FWHM of [OIII] 7, blue comp Intensity in [OIII] 7, red comp Mean LOS vel. in [OIII] 7, red comp FWHM of [OIII] 7, red comp

23 VIMOS Summary of results No obvious binary sources in continuum emission study in more detail [O III] emission 2 3 kpc, mostly aligned with continuum 2kinematiccomponentsoverlapinspace Double-peaked [O III] 7, Hβ in spatially resolved spectra Signs of rotation (?) [O III] / Hb ratio generally high

24 Further exploration of VIMOS data Explore the velocity space more kinematic models, more realistic include overlapping NLRs from 2 AGN use all the possible mappings (I, v, FWHM, channel maps, p-v diagrams) to determine best-fitting model Fourier decomposition (kinemetry, Krajnović et al. 26) Combine gas emission data with stellar continuum Look for disturbed morphologies indicating mergers Absorption lines (e.g. Mg 7) and the 4 Å jump derive stellar kinematics, population ages Search for other emission lines e. g. [O III] 4363 Å derive temperature

25 Kinematic modelling Superposed components Surf.br. Mean v LOS LOS vel.disp. Line : Conical outflow in rotating disk Line 2: Two mis-inclined off-centered rotating disks

26 [O III]/Hβ ratios [OIII] 7 / H_beta [OIII] 7 / H_beta [OIII] 7 / H_beta, q48 indiv. spaxels indiv. spaxels FOV-integrated spectrum FOV-integrated spectrum Ho et al. (997).. 2. R [] [OIII] 7 / H_beta, q9 3 2 indiv. spaxels indiv. spaxels FOV-integrated spectrum FOV-integrated spectrum Ho et al. (997).. 2. R [] [OIII] 7 / H_beta [OIII] 7 / H_beta [OIII] 7 / H_beta, q indiv. spaxels - receding indiv. spaxels - approaching FOV-integ. spectrum - system FOV-integ. spectrum - system 2 Ho et al. (997) R [] [OIII] 7 / H_beta, q indiv. spaxels indiv. spaxels FOV-integrated spectrum FOV-integrated spectrum Ho et al. (997).. 2. R []